Propane boils at -40 some degs. The boiling is what causes the natural pressure in the tank and converts the liquid into a usable gas. Propane is always stored as a liquid and used as a gas. That's one of the questions on the propane filling certification. If the tank is open, there won't be any left to burn because it will have all boiled(evaporated)away. Blowing air through the tank wouldn't hurt. There may be a smell left over from the agent added for smell but it's not flammable by itself. I worked in a shop that repaired sour gas vessels. They cut them apart with a cutting torch after purging but still stunk up the entire shop. After new trays or whatever were installed, they were welded back up. Sour gas is a lot worse than simple propane. There won't be a problem welding a nut on the broken bolt. If it was welded directly on the tank would be a different story. If the tank was sealed the welding would cause increased pressure in the tank that could exceed its limits. I've had square tubing split along the weld because of too much pressure from a lot of welding on a small closed section. Dave
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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